/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.tomcat.util.net;

import javax.net.ssl.SSLSession;
import java.net.Socket;

/* SSLImplementation:

 Abstract factory and base class for all SSL implementations.

 @author EKR
 */
public abstract class SSLImplementation {
	private static final org.apache.juli.logging.Log logger = org.apache.juli.logging.LogFactory
			.getLog(SSLImplementation.class);

	// The default implementations in our search path
	private static final String JSSEImplementationClass =
			"org.apache.tomcat.util.net.jsse.JSSEImplementation";

	private static final String[] implementations = {JSSEImplementationClass};

	public static SSLImplementation getInstance() throws ClassNotFoundException {
		for (int i = 0; i < implementations.length; i++) {
			try {
				SSLImplementation impl = getInstance(implementations[i]);
				return impl;
			} catch (Exception e) {
				if (logger.isTraceEnabled())
					logger.trace("Error creating " + implementations[i], e);
			}
		}

		// If we can't instantiate any of these
		throw new ClassNotFoundException("Can't find any SSL implementation");
	}

	public static SSLImplementation getInstance(String className)
			throws ClassNotFoundException {
		if (className == null)
			return getInstance();

		try {
			// Workaround for the J2SE 1.4.x classloading problem (under
			// Solaris).
			// Class.forName(..) fails without creating class using new.
			// This is an ugly workaround.
			if (JSSEImplementationClass.equals(className)) {
				return new org.apache.tomcat.util.net.jsse.JSSEImplementation();
			}
			Class<?> clazz = Class.forName(className);
			return (SSLImplementation) clazz.newInstance();
		} catch (Exception e) {
			if (logger.isDebugEnabled())
				logger
						.debug("Error loading SSL Implementation " + className,
								e);
			throw new ClassNotFoundException(
					"Error loading SSL Implementation " + className + " :"
							+ e.toString());
		}
	}

	public abstract String getImplementationName();

	public abstract ServerSocketFactory getServerSocketFactory(
			AbstractEndpoint<?> endpoint);

	public abstract SSLSupport getSSLSupport(Socket sock);

	public abstract SSLSupport getSSLSupport(SSLSession session);

	public abstract SSLUtil getSSLUtil(AbstractEndpoint<?> ep);
}
